HYDRAULIC VALVE FOR AN INTERNAL COMBUSTION ENGINE

摘要

A hydraulic valve for use with a lockable cam phaser. The hydraulic valve is configured to limit the flow of pressure medium to both the advance and retard chambers, while allowing a locking pin of the cam phaser to drain. The hydraulic valve effectively limits flow during the self-centering operation of the can phaser. This is important for the system function, since it allows the phaser to select a side (i.e., the advance or retard chamber) to bleed off, reducing pressure on that side, which allows the cam phaser to move towards the mid-park (i.e., locking) position.

主权项

1. A hydraulic valve for use with a lockable cam phaser of an internal combustion engine, said hydraulic valve comprising:
a member; and a spool associated with the member and shiftable into a plurality of positions, said hydraulic valve configured to provide fluid passageways to and from the cam phaser, and said hydraulic valve configured to provide restricted fluid flow to the earn phaser during locking of the cam phaser.